"The Killing" premiered to 2.7 million viewers April 3 and is averaging 2.2 million viewers so far this season. It ranks as AMC's second-highest-rated first-season drama after "The Walking Dead." Series creator Veena Sud ("Cold Case") will return as showrunner.

Fox Television Studios president David Madden, whose company produces the hourlong drama, told The Hollywood Reporter in April that "The Killing" was a risk when it launched.

"'The Killing' is as risky in its form as '24' was when it launched. We'll take a season to tell a very careful, deliberate, twisting/turning mystery that is almost more novelistic in its approach," he said.

Meanwhile in the UK, BBC Four has snapped up Borgen, a ten-part political drama:

Borgen is a compelling drama series about the fight for political power and its consequences. Sidse Babett Knudsen plays 40-year-old party leader Birgitte Nyborg who successfully secures a surprise election victory only to discover the biggest challenge of her life is yet to come.

Privately, Birgitte leads a happy family life with her husband and two children. She is a woman with a burning commitment, a big heart and too little time. Her challenge to be a successful politician and remain true to her beliefs will involve personal sacrifice with far reaching consequences for all those involved.

Borgen's mix of complex characters include cynical but brilliant media adviser, Kasper Juul, and young television political journalist Katrine Fonsmark, whose screen presence has quickly earned her popularity but whose personal life threatens to destroy everything she has worked so hard for.